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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a4967be731accb8904e6c19da20ee90898e959bf2e5d4f81717d5e30eff05385' 
  AND token = 'jxLtUWF6deVNyo4HvlEGsZmITt0sFKFpkW563/NqNHQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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