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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea7fa0437ddba9f89d1c4eed4af63d116d445265b5f29ba0ca2cc67a9a4b8ba7' 
  AND token = 'EJIHEdwemS9rLG523FpKQpGXP2Ub0RENM42j4Wu7UoA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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