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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a4195faf58d3ac9f9a46285b9e39b10508a9c519f2d1d451b36c416de9765cca' 
  AND token = 'jiHMrLkPIvD7YnqlaAWGEsM73/HIf+7O56Fy586q4Ss=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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