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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c8c51b10d9325712ce8be416d55117efe5edd917e2ecb36db5f489f387f9f5c' 
  AND token = '5G2cN0AXjS2HkssBy75aFPJJSekJrT0+j3lc9fhoLBk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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