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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e5ce04be360e1063fa0afbbb04abddc62f789e18d6910c47580a92c2029a0cf1' 
  AND token = '/f89tXYw27kewtLE7EaIDTRx92kTq3Jkqned6YuNAwk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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