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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9256c0b2276ce95954aff706e4e7a0c3b09e0c8d62c109609cf4c0c061a85f50' 
  AND token = 'n08OogH/87fsVWzx3cvMqMyXRYdOqWqRl/BhG5zyjxg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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