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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef95b32d2d448ef69dfbe75cfda2208bb0303bada0b7c8fc1ec5802ac8ecc72a' 
  AND token = 'JIpkfPddFa7c5IgnXwvGaUVBbfnkiMXm1b6wcm8nMhs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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