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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b49895945f50bdb08f62b8ea27ecdd5274e971c93d1341458342610b268fd436' 
  AND token = 'hHscOOWksZD3dnaJKZ0+3vb2w3G/cZHAhJD35SJmv6M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}