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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d3cdd39f962f7a982cf3620feca798f41ffbb38d5ced1aa0c58a6e15d46ebe2' 
  AND token = 'E/aNcObtjKzZ3Wwho2zKsHI/JI1DnWGn9643lq+fN74=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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