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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '054739d17a7fbe99f9979c40c30ae17832ff6986dcca78697010b0a2c3ac945b' 
  AND token = 'ZYCCvutMKdLDVKyIYK2R0FOy4aU4FFQyg7bLFTWu3lw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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