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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '758d45a39571721ce02c348920490add429d4f3c6a492b7ad0600796ced48950' 
  AND token = 'PheVCT3LOxySXcZECUVRNtmN63wgSS8+UGryrWYS2cQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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