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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6a78a4092c8e7f0b02a0e603cf3aa189fe2df3f422ed531245dc234b34a58b11' 
  AND token = '32UYpuoT8gH3ymUH0YYpG6sN6CiOQtEP8mrLk19J9mI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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