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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa3c25130e91df404e2d09f54be6c4ce653d286c60e3cb342558375d18939868' 
  AND token = 'Ld6xM74w73vRh2Y6FdfEGyJEy+xxd6+1OJt+TQuU9CE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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