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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8c0e907dacc760ebc4c0c19982e0bc416ec694ced8e2b6685ef31d2270e1951b' 
  AND token = 'qF6KmQrmfCpU+67G4xTdric46s6pJnLfFHU4cSoexp0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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