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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f8584d3d17e72d6805499423b9e3ff7ea0a19490f82d4a31e68ef88983af4a9' 
  AND token = '7FZc2tVZ7GgKAdlCQ31Rw9N/IjVoEC1/infmflAc3hQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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