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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63f8158c2f3611ce365c9fbcfa89fc4f30634fd38c2079a1c8d9e1717f1e29da' 
  AND token = 'Be0Ze/qYlzxxDVus4EB6935MuAUtKWTveslC5Pd3JLo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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