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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd56114881c262e706cc64baea93298ab5e048337b3fd4b508b2386688af5ee3' 
  AND token = '3D+jmbRbqIVgzd155X4INEs+oHkh4nMrIR90I6cnvbo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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