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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '057b3f06b0563590b6d57c27bc8b9d8459d1c416840e045a9aa7c2ce9e907fdc' 
  AND token = '2zHld+a2Qn/lpF+nABRHxkIeDKaNHJJ0CnHsXoOusys=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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