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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dec747221564c82fd3d236dbd1f35fde5d06ebd1cc141b31f4352f25ceb77565' 
  AND token = 'G2Inp4XctpNivfPDtEbuntCQjTjbzMr2GSnVmomZAJA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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