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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e6646b3c3d84b184c73a2b18702d82e4a777d0423d6397866d12e13ec54dee29' 
  AND token = 'xvotMZcNKeP+1O9ALKADB4J23/a+NJQwMSWF3gwquxQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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